(A) (i) How does the change in curvature of the eye lens helps us in the process of seeing the nearby objects clearly?
(ii) State the range of the power of accommodation of a normal human eye.
OR
(B) Draw a ray diagram to show the correction of eye defect of an old man who can not see an object placed closer than 1 m from his eye, clearly.
(A) (i) How does the change in curvature of the eye lens helps us in the process of seeing the nearby objects clearly?
(ii) State the range of the power of accommodation of a normal human eye.
OR
(B) Draw a ray diagram to show the correction of eye defect of an old man who can not see an object placed closer than 1 m from his eye, clearly.
Official answer
(A) (i) The change in curvature of the eye lens helps us in the process of seeing the nearby objects clearly by increasing the curvature of the eye lens. When the ciliary muscles contract, the eye lens becomes thicker, and its focal length decreases. This enables us to see nearby objects clearly.
(ii) The range of the power of accommodation of a normal human eye is from 25 cm to infinity.
OR
(B) The ray diagram to show the correction of eye defect of an old man who cannot see an object placed closer than 1 m from his eye clearly is shown below. The old man is suffering from hypermetropia. The defect can be corrected by using a convex lens of suitable power.
Marking scheme
- 1.2 marks
Hint
The human eye has the power of accommodation which enables it to see objects clearly at different distances.
Quick oral answer
The human eye has the power of accommodation which enables it to see objects clearly at different distances. The change in curvature of the eye lens helps us in the process of seeing the nearby objects clearly. The range of the power of accommodation of a normal human eye is from 25 cm to infinity. Hypermetropia is a defect of vision in which a person cannot see nearby objects clearly. The defect can be corrected by using a convex lens of suitable power.
Common mistakes
- 1.The change in curvature of the eye lens does not help in seeing nearby objects clearly.
- 2.The range of the power of accommodation of a normal human eye is not from 25 cm to infinity.
Analysis and explanation
The human eye has the power of accommodation which enables it to see objects clearly at different distances. The change in curvature of the eye lens helps us in the process of seeing the nearby objects clearly. The range of the power of accommodation of a normal human eye is from 25 cm to infinity. Hypermetropia is a defect of vision in which a person cannot see nearby objects clearly. The defect can be corrected by using a convex lens of suitable power.
Interesting facts
The human eye can see objects clearly at different distances due to the power of accommodation.
Hypermetropia is a common defect of vision in old age.
Question details
Q34 of 39 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2026
- Section
- Section C
- Marks
- 2
- Type
- Short Answer
- Chapter
- The Human Eye and the Colourful World
- Topic
- The Human Eye
- Bloom's level
- Remembering
- Syllabus topic
- Power of Accommodation
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2026?
This question carries 2 marks in the CBSE Class 10 Science 2026 examination.
Which chapter does this question come from in Science?
This question is from the chapter "The Human Eye and the Colourful World" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "The Human Eye" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2026 paper?
This is a Short Answer question from Section C in the CBSE Class 10 Science 2026 paper.